JP2007183560A - Backlight assembly and liquid crystal display module using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backlight assembly which can reduce cost, labor and time by facilitating selective repair and exchange of only the minimum number of LEDs in the event of a trouble or failure in a part of the LEDs and enables arbitrary change of arrangement for the whole or a part of the LEDs in accordance with the purpose of a user; and also to provide a liquid crystal display device module using the same. <P>SOLUTION: The backlight assembly has a plurality of backlight sub-units in a matrix form, and each of the plurality of the backlight sub-units includes an LED unit including at least one LED that emits a predetermined color arranged in a prescribed arrangement pattern and a partition wall surrounding the LCD unit. The liquid crystal display device module using the backlight assembly is also disclosed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a backlight assembly including LEDs and a liquid crystal display device module using the same, and more specifically, a backlight including a plurality of LED units each including at least one LED having a predetermined emission color as one unit. The present invention relates to an assembly and a liquid crystal display device module using the assembly.

  With the recent full-fledged information era, the display field for displaying images via electrical signals has been rapidly developed. Accordingly, as a flat panel display device (FPD) characterized by light weight and thinness and low power consumption, a liquid crystal display device (LCD), a plasma display panel device (Plasma Display Panel device): PDP), field emission display device (FED), electroluminescence display device (ELD), etc. have been introduced and have been rapidly replaced from the existing cathode ray tube (CRT). .

  Among them, the liquid crystal display device is excellent in moving image display and has a large contrast ratio, and is most often used in the fields of monitors and TVs. In the image realization principle, it utilizes the optical anisotropy and polarization properties of liquid crystal. Liquid crystal has an optical anisotropy that has a long and narrow molecular structure and orientation in an array, and when placed in an electric field. It is known to have a polarization property that the arrangement direction of molecules changes depending on the size.

  As a result, a general liquid crystal display device has a liquid crystal panel in which a liquid crystal layer is interposed between two substrates arranged side by side as an essential component, and the alignment direction of liquid crystal molecules depends on the magnitude of the electric field inside the liquid crystal panel. Is artificially adjusted to change the light transmittance. However, since the liquid crystal panel itself does not include a light emitting element, an illuminating unit capable of projecting a change in transmittance to the outside is separately required, and a backlight assembly with a built-in light source is disposed on the back of the liquid crystal panel. Supply.

  Here, as a light source of the backlight assembly, a mercury discharge lamp such as an external electrode fluorescent lamp (EEFL) or a cold cathode fluorescent lamp (CCFL) has been used. Recently, more and more LEDs that can improve color reproducibility without using toxic mercury (Ag) have been used.

  Meanwhile, the backlight assembly is generally divided into a side light type and a direct type according to the position of a light source that emits light, and the former side light type is located behind the liquid crystal panel. The light of the light source arranged on at least one side is refracted by a separate light guide panel (LGP) and supplied to the liquid crystal panel, while the latter direct type directly arranges a plurality of light sources on the back of the liquid crystal panel. Supply light.

  FIG. 1 is a schematic exploded perspective view of a conventional liquid crystal display device module. The liquid crystal (LCD) panel 10 and the backlight assembly 20 are usually integrated by various mechanical elements for protection from impact and prevention of light leakage. Generally, the LCD panel 10, the backlight unit 20, and various mechanical elements are collectively referred to as a liquid crystal display module (LCD) 1. The LCD module 1 includes an upper and lower liquid crystal panel 10 and a backlight assembly 20, a main frame (40) surrounding these edges, and a bottom frame (cover frame) that covers the back of the backlight assembly 20 and is coupled to the main frame 40. 50), and a top frame (60) assembled with the bottom frame 50 through the main frame 40 around the front edge of the liquid crystal panel 10.

  The backlight assembly 20 includes a plurality of printed circuit boards (PCBs) 22 arranged and fixed in stripes on the inner surface of the bottom frame 50, a plurality of LEDs 24 mounted in a row on each of them, and each LED 24 passes therethrough. A white or silver reflective sheet (26) having a plurality of through-holes 28 and excluding the LEDs 24 and covering and blocking the inner surface of the bottom frame 50; It includes a plurality of optical sheets 32 interposed between the liquid crystal panel 10 at regular intervals.

  Here, the plurality of LEDs 24 generally implements white light by color mixing by arranging RGB LEDs 24 emitting R (red), G (green), and B (blue) light respectively according to a certain rule, The optical sheet 32 is substantially composed of a plurality of sheets including a prism sheet including a diffusion sheet.

  Next, FIG. 2 is a cross-sectional view taken along the cutting line “II-II” of FIG. If this is compared with FIG. 1, each component mentioned above can be confirmed. The light emitted from the plurality of LEDs 24 is reflected directly or by the reflection sheet 26, passes through the optical sheet 32, and then enters the liquid crystal panel 10, whereby the liquid crystal panel 10 can display an image outside.

  However, the liquid crystal display device module using the general backlight assembly 20 has several problems. In the structure in which a plurality of LEDs 24 are mounted in a row on a plurality of printed circuit boards 22 arranged in a stripe form, when any one LED 24 is damaged, the entire printed circuit board 22 in the corresponding row is removed. It must be replaced or repaired, and even the normal LEDs 24 are damaged during this process. Thus, the prior art backlight assembly has the disadvantage of costly and time consuming to repair it.

  In addition, the plurality of LEDs 24 mounted on the printed circuit board 22 with the above-described structure is virtually impossible to be exchanged at an arbitrary position. However, there is a drawback that it is impossible to cope with the case where the expected color reproducibility and brightness cannot be obtained.

  In the general backlight assembly 20, so-called split driving is difficult. Divided drive is a method of increasing the contrast ratio by emitting only the light source of the corresponding part in order to display a relatively strong high luminance only on a part of the display screen like a blast scene.

  Further, one of the most important matters in the general backlight assembly 20 is to sufficiently mix the RGB color light emitted from each of the RGB LEDs 24 before reaching the liquid crystal panel 10. Therefore, as described above, in the structure in which the plurality of LEDs 24 are arranged on the stripe-shaped printed circuit board 22 in rows at a constant pitch, the main emission angle of the LEDs 24 is set as lateral as possible. The distance between the LED 24 and the optical sheet 32 must be ensured to be equal to or greater than a certain distance so that a sufficient color mixing space is ensured and a separate diffusion member is interposed between the LED 24 and the optical sheet 32. Various diffusion design structures are required.

  However, even if only some of the LEDs 24 are caused to emit light by split driving by such various diffusion design structures, a weak luminance portion remains in the vicinity of the column boundary.

  The present invention has been devised to solve the above-mentioned problems, and it is possible to selectively repair and replace only a minimum number of LEDs when some LEDs fail or break down. And a backlight assembly that can be freely changed in arrangement for all or some of the LEDs according to the user's purpose, and exhibits characteristics suitable for divided driving, and the like. The object is to provide a liquid crystal display module.

To achieve the above object, according to a first aspect of the present invention, in a backlight assembly having a plurality of matrix-like backlight subunits, each of the plurality of backlight subunits is arranged in a predetermined arrangement pattern. In addition, an LED unit including at least one LED having a predetermined emission color and a partition wall surrounding the LED unit are provided.

In the first aspect, the partition wall surrounds the LED unit to define a light emitting region.

The plurality of backlight subunits further include a plurality of optical sheets. Each of the plurality of optical sheets was disposed on the LED unit.
Each of the plurality of optical sheets has a convex dome shape when viewed from the LED unit.
In addition, one optical sheet is further included on the plurality of backlight subunits.

  Each of the backlight subunits includes a transparent window interposed between the LED unit and the optical sheet, and at least one diverter positioned on the lower surface of the transparent window and facing at least one LED.

  Each of the backlight subunits includes a printed circuit board (PCB) on which at least one LED is mounted, and a reflection sheet that covers the PCB and has at least one through hole that exposes at least one LED. .

Here, a plug connector provided on the first side of the PCB and a socket connector provided on the second side adjacent to the first side of the PCB are provided, and a plurality of backlight subunits are connected by the plug connector and the socket connector. It was set as the structure connected mutually.
Moreover, it was set as the structure provided with the connector terminal on the lower surface of PCB.

  Further, the optical sheet includes a diffusion sheet. Further, the partition wall is selected from one of a transparent material, an opaque reflection material, and a translucent diffusion material. Moreover, the partition was made into a lattice shape.

Further, the predetermined emission color may be white (W), or at least one of the LEDs may be a white (W) LED. Also, at least one of the LED units may include at least one red (R) LED, at least one green (G) LED, and at least one blue (B) LED.
And said arrangement | positioning pattern is good also as a shape formed with four LED which comprises a straight line, a triangle shape, square shape, or four points, and one LED located in the center of these four points.
Moreover, you may enable it to repair each LED unit independently.

  A second aspect of the present invention is a liquid crystal display module, which is a backlight assembly having a plurality of matrix-like backlight subunits, and each of the plurality of backlight subunits is arranged in a predetermined arrangement pattern. A backlight unit including an LED unit including at least one LED of a predetermined emission color and a partition wall surrounding the LED unit; a bottom frame positioned on a lower surface of the backlight assembly; positioned on an upper surface of the backlight assembly A liquid crystal panel; a backlight assembly and a main frame surrounding the edge of the liquid crystal panel; a top frame surrounding the front edge of the liquid crystal panel; and a backlight driving circuit outside the bottom frame, electrically connected to the plurality of LED units Liquid crystal display module consisting of backlight drive circuit Is Lumpur.

In the second aspect, the backlight driving circuit is electrically connected to each of the plurality of backlight subunits.
Each of the backlight subunits includes a printed circuit board (PCB) on which at least one LED is mounted, and a reflection sheet that covers the PCB and has at least one through hole that exposes at least one LED. .

Furthermore, the connector terminal is provided on the lower surface of the PCB.
Further, the backlight driving circuit is electrically connected to the plurality of backlight subunits via the connector terminals.

  In addition, the bottom frame has at least one opening that exposes one connector terminal, and the backlight driving circuit is connected to the connector terminal through the opening.

Further, the backlight assembly includes a plug connector provided on the first side of the PCB and a socket connector provided on the second side adjacent to the first side of the PCB.
In addition, the backlight drive circuit is connected to the plug connector and the socket connector via a cable.

  Furthermore, in the first and second aspects, the plurality of backlight subunits are divided into at least two groups, and each group is driven by the same signal. The PCB was a metal core PCB.

  The backlight assembly according to the present invention provides a uniform surface light source in which each of the backlight subunits is white, and the backlight subunit has a matrix shape along the inner surface of the bottom frame to form a matrix array. Since a plurality of them are arranged, there is an advantage that a uniform white surface light source can be provided for the entire liquid crystal panel. In this case, since each backlight subunit is individually separated into individual partitions by partition walls, it is only necessary to replace the corresponding backlight subunit when some LEDs fail or break. As a result, the cost, labor and time required for repair and replacement can be greatly reduced. As described above, the arrangement of the LEDs mounted in the backlight subunit according to the present invention is practically unlimited, and thus any arrangement of all or some of the LEDs can be freely changed according to the user's purpose. There is a feature.

  In particular, each of these backlight subunits has the advantage that it defines an independent light emitting area and can be driven in individual bulk units and is therefore very suitable for split drive.

  Hereinafter, the present invention will be described in more detail with reference to the drawings.

  FIG. 3 is a schematic exploded perspective view of a liquid crystal display device module according to an embodiment of the present invention, which includes a liquid crystal panel 110 and a backlight assembly 120 that are vertically stacked.

  These frames are surrounded by a main frame 150 made of stainless steel or a synthetic resin mold, and a bottom frame 160 for keeping the overall shape and minimizing light leakage covers the back of the backlight assembly 120. A top frame 170 that is coupled to the main frame 150 and surrounds the front edge of the liquid crystal panel 110 is assembled with the bottom frame 160 through the main frame 150 to be integrated into a module.

  Each will be described specifically.

  First, the liquid crystal panel 110 includes a first substrate 112 and a second substrate 114 that are responsible for the central role of image expression and are bonded together with a liquid crystal layer interposed therebetween.

  Here, under the assumption that the liquid crystal panel 110 is an active matrix system, although not clearly shown in the drawing, a plurality of gate lines and data lines intersect on the inner surface of a first substrate 112 called a lower substrate or an array substrate, and pixels ( pixel) is defined, and a thin film transistor (TFT) is provided at each intersection, and is connected to the transparent pixel electrode mounted on each pixel on a one-to-one basis.

  An inner surface of a second substrate 114 called an upper substrate or a color filter substrate corresponds to each pixel. As an example, an R (red), G (green), and B (blue) color filter and a black matrix that surrounds each of these and blocks non-display elements such as gate lines, data lines, and thin film transistors are provided. A transparent common electrode that covers the matrix is provided.

  Further, a liquid crystal panel driving circuit is connected along at least one edge of the liquid crystal panel 110 through a flexible circuit board, TCP (Tape Carrier Package: 116) or the like, and the side or bottom of the main frame 150 is formed in the modularization process. The liquid crystal panel driving circuit is suitably warped and closely attached to the back surface of the frame 160. The liquid crystal panel driving circuit includes a gate driving circuit for transmitting an on / off scanning signal of a thin film transistor through a gate line and a data driving circuit for transmitting an image signal for each frame to a data line. The liquid crystal panel 110 may be positioned at two edges adjacent to each other.

  In the liquid crystal panel 110 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the scanning signal of the gate driving circuit for transmitting the scan, the image signal of the data driving circuit is transmitted to the pixel via the data line. This is transmitted to the electrode, and the arrangement direction of the liquid crystal molecules is changed by the vertical electric field between the pixel electrode and the common electrode, thereby showing a difference in transmittance.

  The backlight assembly 120 according to the present invention is disposed on the back surface of the liquid crystal panel 110 to supply light so that the difference in transmittance can be projected to the outside.

  In this case, the backlight assembly 120 according to the present invention is divided into a plurality of LED units (LU) each having at least one LED, and includes a plurality of backlight subunits 122 having a matrix shape. A uniform white light is supplied to the liquid crystal panel 110 while being arranged in a matrix along the inner surface of the frame 160. Such a backlight subunit 122 can be divided into several embodiments according to a detailed configuration, and will be described separately.

  In particular, the backlight subunit 122 is formed of individualized rose units.

  For convenience, in the description of each embodiment, an identification code of a and b is added after the drawing code 122 of the backlight subunit to distinguish each other.

  4A and 4B are views illustrating a backlight assembly based on one LED unit according to an embodiment of the present invention. 4A is an exploded perspective view, and FIG. 4B is a cross-sectional view. The backlight subunit 122a according to the present embodiment includes a plurality of LED units (LU) each having at least one LED 124 that emits light forward to realize a predetermined color, a partition wall 130 surrounding the LED unit (LU), and the like. An optical sheet 146 disposed on the partition wall 130 and covering the front of the LED 124 is included.

  First, the partition wall 130 separates a plurality of LED units (LU) each having at least one LED 124 to define independent light emitting areas ER. For this purpose, a transparent material, a translucent diffusion material, or an opaque reflection is used. It is comprised with a material and can be comprised with a plate structure. The partition wall 130 can have a lattice shape. In particular, the backlight subunit 122a may have a quadrangular prism shape by providing four surfaces that are perpendicular to each other such that the overall shape of the backlight subunit 122a exhibits a hexahedral shape.

  In this case, a transparent synthetic resin such as acrylic having a transmittance of 90% or more can be used for the transparent material forming the partition wall 130, and a synthetic resin having a transmittance of about 50% to 90% for the translucent diffusion material. A molded product can be used, and as an example, it can be made into a form produced by adding a diffusion agent of aluminum particles or other material particles having reflection characteristics during injection molding of PMMA (Poly Methyl Meth Acrylate). In the case of an opaque reflective material, a metal having a high surface reflectance such as aluminum (Al) can be used.

  Next, the LED 124 mounted in the light emitting region ER by the partition wall 130 has a role of a light source that finally supplies white light. For this reason, RGB LEDs 124 that emit RGB color light can be arranged according to a predetermined rule to implement white light by color mixing, or at least one W (white) LED 124 that emits white light can be used. Details of this will be described in detail in this section.

  Meanwhile, the LED 124 is mounted on the printed circuit board 126. When such a printed circuit board 126 is exposed in the light emitting region ER, the light efficiency is lowered. Therefore, a reflective sheet 134 that selectively exposes only the LEDs 124 is employed. For this purpose, the reflection sheet 134 is formed with through holes 136 into which the LEDs 124 are inserted in a one-to-one correspondence, so that only the LEDs 124 are exposed and the printed circuit board 126 is covered and blocked. Therefore, the reflection sheet 134 plays a role of a substantial bottom surface in the light emitting region ER.

  Finally, the optical sheet 146 plays a role of processing the light emitted from the LED 124 in the form of a uniform surface light source, and may include at least one prism sheet including a diffusion sheet. It is placed on the traveling path of the light emitted from the LED 124 together with the substantial ceiling surface role in the light emitting region ER. Further, one additional optical sheet may be arranged on the upper surface of the entire matrix composed of a plurality of backlight subunits.

  As a result, the light emitted from the LED 124 is processed in the form of a uniform surface light source while passing through the optical sheet 146 directly or in the process of being reflected forward by the reflection sheet 134 and proceeding forward toward the liquid crystal panel (see 110 in FIG. 3). Is done. A uniform surface light source is supplied to the entire liquid crystal panel (see 110 in FIG. 3) by arranging such backlight subunits 122a in a matrix along the inner surface of the bottom frame (see 160 in FIG. 3). be able to.

  5A and 5B are views for a backlight assembly based on one backlight subunit according to an embodiment of the present invention, FIG. 5A is an exploded perspective view, and FIG. 5B is a cross-sectional view. The same elements having the same roles as those of the first embodiment described above are denoted by the same reference numerals, and redundant description will be omitted, and only differences will be described.

  As a result, the present embodiment is characterized in that the transparent window 140 is interposed between the LED 124 and the optical sheet 146 in the light emitting region ER, and a reflective dot (diverter: diver) 142 is attached to reflect or diffuse the light emitted from the LED 124.

  Here, the role of the reflective dot (diverter) 142 is to implement a more uniform surface light source by reflecting and diffusing the linear light emitted from the LED 124, and at the same time weight the color mixture. The reflective dots (diverter) 142 for this purpose may be made of a white or silver sheet similar to the reflective sheet 134 and may correspond to at least one LED 124 on a one-to-one basis. The transparent window 140 serves to support the reflective dots (diverter) 142 so as to maintain a certain distance from the LED 124.

  Other parts are the same as those in the first embodiment. That is, the printed circuit board 126 and at least one LED 124 mounted thereon are formed of a transparent material, a translucent diffusing material, or an opaque reflecting material so as to define an independent light emitting region ER around the LED 124. A substantially bottom surface in the light emitting region ER while blocking other portions such as the printed circuit board 126 excluding the LED 124 and the optical sheet 146 disposed on the partition wall 130 and placed in front of the LED 124. The reflection sheet 134 and the like to be formed are the same as in the previous embodiment.

  The LED unit (LU) includes LEDs 124 arranged in various ways to emit white light.

  For example, at least one RGB • LED 124 is mounted in the LED light emitting region ER, and white light can be realized by mixing these colors. Here, the RGB / LEDs 124 can form a certain combination, and can be RGB, GRBG, RGGB, GRBGR, etc. if they are represented by abbreviations indicating the respective colors for convenience. An LED unit (LU) can be formed by arranging in a single row or a double row, or by repeatedly arranging a single row or a double row in a plurality of times. Further, in one example, the RGB / LED 124 is a triangular arrangement form that forms a triangular apex, the GRBG or RGGB / LED 124 is a square arrangement form that forms a quadrilateral apex, and the GRBGR / LED 124 is one of the centers and a quadrangular apex that surrounds it. One LED unit (LU) can also be configured with an arrangement structure such as a five-way arrangement form. Further, the present invention is not limited to this, and various arrangements can be applied to the backlight subunit 122b.

  In contrast, it is also possible to mount at least one W • LED 124 that emits white light in the light emitting region ER of the backlight subunit 122, and it is easy to arrange the arrangement according to the purpose. Can be expected.

  In addition, as an example in which the above-described two types of cases are mixed, an appropriate number of RGB / LEDs 124 and W / LEDs 124 are arranged in a predetermined form in the light emitting region ER of the backlight subunit 122 to form one LED unit (LU ) Can also be formed.

  Hereinafter, FIGS. 6A to 6H are views illustrating an arrangement structure of LEDs forming one unit according to an embodiment of the present invention. FIG. 6A is a diagram in which RGGB / LEDs 124 arranged in a straight line are arranged in a line in the light emitting region ER to form one LED unit (LU), and FIG. 6B is a combination of RGGB / LEDs 124 arranged in a line. 6C shows a case where the units are repeatedly arranged in two rows in the light emitting region ER. FIG. 6C shows a structure in which RGGB / LEDs 124 arranged in a straight line are repeatedly arranged in a row in the light emitting region ER. The example which formed the LED unit (LU) is shown. FIG. 6D shows an example in which unit combinations of RGGB / LEDs 124 arranged in a straight line are repeatedly arranged four times in the light emitting region ER to form two rows, and FIG. 6E shows a square arrangement of GRBG / RGGB / LEDs 124. Are arranged in a line in the light emitting region ER, and FIG. 6F shows a case in which triangular arrangements of RGB / LEDs 124 are arranged in a line in the light emitting region ER.

  In contrast, FIG. 6G shows a case where the W • LED 124 that emits white light itself is arranged in the light emitting region, and FIG. 6H shows that the triangular arrangement of the RGB • LED 124 is repeated six times in the light emitting region ER. It is a diagram showing that the triangular arrangement of RGB / LED 124 can be collected and arranged in an LED cluster type.

  Here, it is needless to say that all the above arrangement relationships can be applied to the first and second embodiments.

  The operation of the backlight subunit 122 according to the present invention described above can be controlled by a separate backlight driving circuit, and such a backlight driving circuit has a bottom frame (see FIG. 3) to minimize the mounting area. 160, and so on.) Each backlight subunit can be connected to the backlight driving circuit through an appropriate method, since it can be provided on the back surface.

FIG. 7 is a perspective view of the backlight subunit of the present invention.
Referring to FIGS. 4A, 4B, 5A and 5B together, in FIG. 7, a plurality of backlight subunits 122 are arranged in a matrix. The backlight subunit 122 is divided into at least two groups (for example, GP1 and GP2 in FIG. 7). Although not shown, each group is driven by the same signal. According to this configuration, it is suitable for the above-described divided drive, and if divided into more groups, finer divided drive control can be performed.

  Here, the method of connecting the backlight subunit 122 according to the present invention to the backlight driving circuit can be roughly divided into two types. FIGS. 8A and 8B are schematic exploded perspective views illustrating a connection structure between a backlight subunit and a backlight driving circuit according to an exemplary embodiment of the present invention. The circuit board 126 and at least one LED 124 mounted thereon, the bottom frame 160, and a part of the backlight driving circuit 190 provided on the back of the bottom frame 160 appear together.

  As shown in FIG. 8A, a plurality of backlight subunits 122 divided into a plurality of LED units (LU) each having at least one LED 124 implementing a predetermined color according to the present invention are interconnected. The driver circuit 190 can be connected. For this reason, at least one plug connector 127 protrudes laterally from the printed circuit board 126 of each backlight subunit 122, and at the same time, at least one socket connector 128 can be provided laterally.

  As a result, a plurality of backlight subunits 122 arranged in a matrix having a matrix shape on the inner surface of the bottom frame 160 are shown in a form in which columns or rows or all are interconnected by the plug connector 127 and the socket connector 128. Finally, an arbitrary plug connector 127 and / or socket connector 128 can be connected to the backlight driving circuit 190 on the back surface of the bottom frame 160 via a separate cable 200. With this configuration, one backlight subunit 122 can be repaired (for example, replaced) alone. Further, as shown in FIG. 8A, the plug connector 127 can be provided on two adjacent sides of the backlight subunit 122, and the socket connector 128 can be provided on the other two adjacent sides. Thereby, the backlight subunit 122 can be connected in four directions.

  Next, FIG. 8B illustrates a plurality of backlight subunits 122 each including a plurality of LED units (LU) each including at least one LED 124 that implements a predetermined color along the inner surface of the bottom frame 160. Shows a form of a one-to-one correspondence connection with the backlight driving circuit 190 on the rear surface of the bottom frame 160. Connector terminals 129 protrude downward from the back surface of the printed circuit board 126 of each backlight subunit 122, and the bottom frame 160 is provided with a connecting hole 162 into which each of the connector terminals 129 is inserted.

  Therefore, the connector terminals 129 of each of the plurality of backlight subunits 122 arranged in matrix along the inner surface of the bottom frame 160 are exposed to the back surface of the bottom frame 160 through the connecting holes 162 of the bottom frame 160. Here, the backlight driving circuit 190 can be directly connected by a method such as soldering.

  Further, the PCB 126 may be a metal core PCB. The metal core PCB enables efficient heat dissipation of the LED 124, which is suitable for the LED 124.

FIG. 9 is a cross-sectional view of the backlight subunit of the present invention.
As shown in FIG. 9 (see also FIGS. 4B and 5B), the backlight subunit 122 includes an optical sheet 246 different from the above-described embodiment, such as a dome shape (DS).

  In addition, about the shape of the optical sheet 246, although only sectional drawing from one direction (front) is shown in FIG. 9, sectional drawing from another direction (side of FIG. 9) is also the same. By making the optical sheet into a dome shape, the image quality at the boundary between the optical sheets 246 is improved.

FIG. 6 is a schematic exploded perspective view of a conventional liquid crystal display device module. FIG. 2 is a cross-sectional view taken along the cutting line “II-II” of FIG. 1. 1 is a schematic exploded perspective view of a liquid crystal display device module according to an embodiment of the present invention. 1 is an exploded perspective view of a backlight assembly based on one backlight subunit according to an exemplary embodiment of the present invention. 1 is a cross-sectional view of a backlight assembly based on one backlight subunit according to an exemplary embodiment of the present invention. 1 is an exploded perspective view of a backlight assembly based on one backlight subunit according to an exemplary embodiment of the present invention. 1 is a cross-sectional view of a backlight assembly based on one backlight subunit according to an exemplary embodiment of the present invention. 1 is a diagram illustrating an LED arrangement structure forming one LED unit according to an embodiment of the present invention. 1 is a diagram illustrating an LED arrangement structure forming one LED unit according to an embodiment of the present invention. 1 is a diagram illustrating an LED arrangement structure forming one LED unit according to an embodiment of the present invention. 1 is a diagram illustrating an LED arrangement structure forming one LED unit according to an embodiment of the present invention. 1 is a diagram illustrating an LED arrangement structure forming one LED unit according to an embodiment of the present invention. 1 is a diagram illustrating an LED arrangement structure forming one LED unit according to an embodiment of the present invention. 1 is a diagram illustrating an LED arrangement structure forming one LED unit according to an embodiment of the present invention. 1 is a diagram illustrating an LED arrangement structure forming one LED unit according to an embodiment of the present invention. 1 is a perspective view of a plurality of backlight subunits according to an embodiment of the present invention. 1 is a schematic exploded perspective view illustrating a connection structure between a backlight subunit and a backlight driving circuit according to an embodiment of the present invention. 1 is a schematic exploded perspective view illustrating a connection structure between a backlight subunit and a backlight driving circuit according to an embodiment of the present invention. 1 is a cross-sectional view of a backlight subunit according to an embodiment of the present invention.

Explanation of symbols

110: Liquid crystal panel 112, 114: First and second substrates 116: TCP
120: Backlight assembly 122: Backlight subunit 124: LED
126: Printed circuit board (PCB)
130: Partition 134: Reflective sheet 136: Through hole 140: Transparent window 142: Reflective dot (diverter)
146: Optical sheet 150: Main frame 160: Bottom frame 170: Top frame LU: LED unit

Claims (28)

A backlight assembly having a plurality of matrix-like backlight subunits, each of the plurality of backlight subunits,
A backlight assembly comprising: an LED unit including at least one LED having a predetermined emission color arranged in a predetermined arrangement pattern; and a partition wall surrounding the LED unit.   2. The backlight assembly according to claim 1, wherein the partition wall surrounds the LED unit and defines a light emitting area.   The backlight assembly of claim 1, wherein the plurality of backlight subunits further include a plurality of optical sheets.   4. The backlight assembly according to claim 3, wherein each of the plurality of optical sheets is disposed on the LED unit.   4. The backlight assembly according to claim 3, wherein each of the plurality of optical sheets has a convex dome shape when viewed from the LED unit.   5. The backlight assembly according to claim 4, further comprising an optical sheet on the plurality of backlight subunits. 5. The backlight assembly of claim 4, wherein each of the backlight subunits is
A backlight assembly, comprising: a transparent window inserted between the LED unit and the optical sheet; and at least one diverter positioned on a lower surface of the transparent window and facing at least one of the LEDs. The backlight assembly of claim 1, wherein each of the backlight subunits is
A backlight assembly comprising: a printed circuit board (PCB) on which at least one LED is mounted; and a reflective sheet having at least one through hole covering the PCB and exposing the at least one LED. The backlight assembly of claim 8, further comprising:
A plug connector provided on the first side of the PCB, and a socket connector provided on a second side adjacent to the first side of the PCB;
A backlight assembly in which the plurality of backlight subunits are interconnected by the plug connector and the socket connector.   9. The backlight assembly according to claim 8, further comprising a connector terminal on a lower surface of the PCB.   The backlight assembly of claim 1, wherein the optical sheet includes a diffusion sheet.   2. The backlight assembly of claim 1, wherein the partition is selected from one of a transparent material, an opaque reflective material, and a translucent diffusing material.   The backlight assembly according to claim 1, wherein the partition walls have a lattice shape.   2. The backlight assembly according to claim 1, wherein the predetermined emission color is white (W).   The backlight assembly of claim 1, wherein at least one of the LEDs is a white (W) LED.   The backlight assembly of claim 1, wherein at least one of the LED units includes at least one red (R) LED, at least one green (G) LED, and at least one blue (B) LED.   2. The backlight assembly according to claim 1, wherein the arrangement pattern is a straight line, a triangular shape, a quadrangular shape, or a shape formed by four LEDs constituting four points and one LED located at the center of the four points. There is a backlight assembly.   2. The backlight assembly according to claim 1, wherein each of the LED units can be repaired independently. A liquid crystal display module,
A backlight assembly having a plurality of matrix-like backlight subunits, each of the plurality of backlight subunits including at least one LED of a predetermined emission color arranged in a predetermined arrangement pattern And a backlight assembly including a partition wall surrounding the LED unit,
A bottom frame located on a lower surface of the backlight assembly;
A liquid crystal panel located on the upper surface of the backlight assembly;
A main frame surrounding an edge of the backlight assembly and the liquid crystal panel;
A liquid crystal display module comprising a top frame surrounding a front edge of the liquid crystal panel, and a backlight drive circuit outside the bottom frame, the backlight drive circuit being electrically connected to the plurality of LED units.   20. The liquid crystal display module according to claim 19, wherein the backlight driving circuit is electrically connected to each of the plurality of backlight subunits. The liquid crystal display module according to claim 19, wherein each of the backlight subunits comprises:
A liquid crystal display module comprising: a printed circuit board (PCB) on which at least one of the LEDs is mounted; and a reflective sheet that covers the PCB and has at least one through hole that exposes the at least one LED.   21. The liquid crystal display module according to claim 20, further comprising a connector terminal on a lower surface of the PCB.   23. The liquid crystal display module according to claim 22, wherein the backlight driving circuit is electrically connected to the plurality of backlight subunits via the connector terminals.   23. The liquid crystal display module according to claim 22, wherein the bottom frame has at least one opening for exposing the one connector terminal, and the backlight driving circuit is connected to the connector terminal through the opening. Liquid crystal display module. The liquid crystal display module according to claim 21, wherein the backlight assembly includes:
A liquid crystal display module comprising: a plug connector provided on the first side of the PCB; and a socket connector provided on a second side adjacent to the first side of the PCB.   23. The liquid crystal display module according to claim 22, wherein the backlight drive circuit is connected to the plug connector and the socket connector via a cable.   21. The backlight assembly according to claim 8 or the liquid crystal display module according to claim 20, wherein the plurality of backlight subunits are divided into at least two groups, and the groups are driven by the same signal in each group.   The backlight assembly according to claim 8 or the liquid crystal display module according to claim 20, wherein the PCB is a metal core PCB.

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